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United States Patent | 5,750,728 |
Wagner ,   et al. | May 12, 1998 |
Aromatic bromomethyl compounds play a major role in the synthesis of active substances. They can be obtained in particularly pure form by the free-radical bromination of aromatic methyl compounds in the solvent chlorobenzene.
Inventors: | Wagner; Adalbert (Hattersheim/Main, DE); Kleemann; Heinz-Werner (Bad Homburg, DE); Regnat; Dieter (Frankfurt am Main, DE); Kleiner; Hans-Jerg (Kronberg/Taunus, DE) |
Assignee: | Clariant GmbH (Frankfurt, DE) |
Appl. No.: | 763877 |
Filed: | December 11, 1996 |
Oct 29, 1992[DE] | 42 36 476.0 | |
Mar 18, 1993[DE] | 43 08 562.8 |
Current U.S. Class: | 549/57; 549/49; 570/183 |
Intern'l Class: | C07D 333/56; C07D 333/52; C07C 022/04 |
Field of Search: | 570/183 549/57,49,58 |
4692527 | Sep., 1987 | Leininger et al. | 544/405. |
4740519 | Apr., 1988 | Shroot et al. | 514/443. |
5420300 | May., 1995 | Dormoy | 549/49. |
Foreign Patent Documents | |||
0828545 | Jan., 1952 | DE. |
McMurry, "Organic Chemistry", 2nd. Ed., (1988), pp. 553-554. Morrison & Boyd, "Organic Chemistry", 4th Ed., (1983), pp. 641-643. Korke et al, "Bromination of Methyl Groups Bonded to Aromatic Rings", CA 114:81213, (1991). Vaccher, Claud et al Synthetic Communication, Bd. 23, Nr. 5, 1993, pp. 671-679. Sugiura Tsuneyuki et al, SYNLETT, Bd. 6, Jun. 1992, Stuttgart De pp. 531-533. "Bromination--Introducing Bromine Into An Organic Compound By Addition or Substitution", Rompps Chemie-Lexikon, Achte, neubearbeitete und erweiterte Auflage, Dr. Otto-Albrecht Neumuller, Franckh'sche Verlagshandlung, W. Keller and Co., Stuttgart, 1979, p. 521. |
__________________________________________________________________________ Ex. MS R.sub.f no. ACH.sub.2Br (M.sup.+ + H) (eluent) __________________________________________________________________________ 2 ##STR4## 286 0.2 (E/H 1/4) 3 ##STR5## 371 0.6 (E/H 1/2) 4 ##STR6## 285 0.4 (E/H 1/2) 5 ##STR7## 313 0.35 (E/H 1/4) 6 ##STR8## 313 0.15 (E/H 4/1) 7 ##STR9## 361 0.4 (E/H 1/1) 8 ##STR10## 234 distilled 9 ##STR11## 230 0.8 (E/H 2/1) 10 ##STR12## 363 0.35 (E) 11 ##STR13## 253 0.5 (E/H 1/4) 12 ##STR14## 305 0.3 (E/H 1/1) 13 ##STR15## 400 0.4 (E/H/CH.sub.3 CO.sub.2 H 1/1 + 1%) 14 ##STR16## 360 0.3 (E/H 1/1) 15 ##STR17## 359 0.5 (E/H 1/1) 16 ##STR18## 297 0.4 (E/H 1/1) 17 ##STR19## 404 0.6 (E/H 1/1) 18 ##STR20## 348 0.6 (E/H 1/1) 19 ##STR21## 378 0.35 (E/H 1/1) 20 ##STR22## 377 0.3 (E/H 1/1) 21 ##STR23## 359 0.25 (E/H 1/1) 22 ##STR24## 377 0.3 (E/H/ 1/1) 23 ##STR25## 359 0.3 (E/H 4/1) 24 ##STR26## 359 0.3 (H/E 1/1) 25 ##STR27## 326 0.3 (H/E 1/1) 26 ##STR28## 312 0.4 (E/H 1/1) 27 ##STR29## 337 0.4 (E/H 1/1) 28 ##STR30## 356 0.15 (DIP/H 1/10) 29 ##STR31## 306 0.15 (DIP/H 1/10) 30 ##STR32## 272 0.2 (DIP/H 1/1) 31 ##STR33## 317 0.4 (E/H 1/1) 32 ##STR34## 366 0.4 (DIP) __________________________________________________________________________ Abbreviations: H = nheptane E = ethyl acetate DIP = diisopropyl ether NBS = Nbromosuccinimide